Are you suggesting that the arbitrator(s) voluntary mandated by the two opposing parties haven't had that opportunity?
If the lawyer representing Ericsson and Nasr is to be believed, yes. He said they had no idea that van der Garde had gone to the Swiss court, and they had to take leave to appear in the Melbourne court. It seems pretty clear that he blindsided them, so I have to wonder what else might have happened.
If, for whatever valid reasons, Sauber are indeed not respecting their initial engagements, isn't up to them to fix the situation in order to avoid a complete predictable mess?
Yes, but their argument is that it wasn't a contract to race - it was a pre-contract with van der Garde's sponsors, one that essentially arranged the details between them pending the offer of a full-time drive. That offer was never made - van der Garde himself denied having signed anything as late as August, despite now claiming to have signed the contract in June.
Evidently something somewhere along the line changed. Van der Garde made half a dozen FP1 appearances last year, and the team were obviously interested in him. But even after they took Ericsson, it was still weeks - if not months - before they settled on Nasr. What changes for van der Garde? I highly doubt that the team simply got a better offer.
But let me ask you - why didn't van der Garde go to the FIA Contract Review Board? They're supposed to be the first port of call for this sort of thing.
I suspect that van der Garde signed a pre-contract and was expecting a full offer, which never came, and he is now challenging the status quo. If that's the case, then it comes down to what the pre-contract actually offered - in cases with a pre-contract, a team usually has the option of making a driver an offer, rather than an obligation to do so.